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-rw-r--r--drivers/misc/c2port/c2port-duramar2150.c4
-rw-r--r--drivers/misc/cxl/api.c4
-rw-r--r--drivers/misc/cxl/cxl.h3
-rw-r--r--drivers/misc/cxl/file.c15
-rw-r--r--drivers/misc/cxl/main.c2
-rw-r--r--drivers/misc/cxl/native.c14
-rw-r--r--drivers/misc/cxl/pci.c46
-rw-r--r--drivers/misc/cxl/vphb.c61
-rw-r--r--drivers/misc/eeprom/at24.c19
-rw-r--r--drivers/misc/enclosure.c14
-rw-r--r--drivers/misc/lkdtm_core.c4
-rw-r--r--drivers/misc/mei/bus.c4
-rw-r--r--drivers/misc/mei/client.c3
-rw-r--r--drivers/misc/mei/main.c48
-rw-r--r--drivers/misc/mic/vop/vop_vringh.c1
-rw-r--r--drivers/misc/panel.c23
16 files changed, 189 insertions, 76 deletions
diff --git a/drivers/misc/c2port/c2port-duramar2150.c b/drivers/misc/c2port/c2port-duramar2150.c
index 5484301d57d9..3dc61ea7dc64 100644
--- a/drivers/misc/c2port/c2port-duramar2150.c
+++ b/drivers/misc/c2port/c2port-duramar2150.c
@@ -129,8 +129,8 @@ static int __init duramar2150_c2port_init(void)
duramar2150_c2port_dev = c2port_device_register("uc",
&duramar2150_c2port_ops, NULL);
- if (!duramar2150_c2port_dev) {
- ret = -ENODEV;
+ if (IS_ERR(duramar2150_c2port_dev)) {
+ ret = PTR_ERR(duramar2150_c2port_dev);
goto free_region;
}
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index 2e5233b60971..ae856161faa9 100644
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -244,6 +244,10 @@ int cxl_start_context(struct cxl_context *ctx, u64 wed,
ctx->real_mode = false;
}
+ /*
+ * Increment driver use count. Enables global TLBIs for hash
+ * and callbacks to handle the segment table
+ */
cxl_ctx_get();
if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index a144073593fa..52ee3da85366 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -419,6 +419,9 @@ struct cxl_afu {
struct mutex contexts_lock;
spinlock_t afu_cntl_lock;
+ /* -1: AFU deconfigured/locked, >= 0: number of readers */
+ atomic_t configured_state;
+
/* AFU error buffer fields and bin attribute for sysfs */
u64 eb_len, eb_offset;
struct bin_attribute attr_eb;
diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c
index 77080cc5fa0a..d3e009438991 100644
--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -91,7 +91,6 @@ static int __afu_open(struct inode *inode, struct file *file, bool master)
pr_devel("afu_open pe: %i\n", ctx->pe);
file->private_data = ctx;
- cxl_ctx_get();
/* indicate success */
rc = 0;
@@ -155,11 +154,8 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
/* Do this outside the status_mutex to avoid a circular dependency with
* the locking in cxl_mmap_fault() */
- if (copy_from_user(&work, uwork,
- sizeof(struct cxl_ioctl_start_work))) {
- rc = -EFAULT;
- goto out;
- }
+ if (copy_from_user(&work, uwork, sizeof(work)))
+ return -EFAULT;
mutex_lock(&ctx->status_mutex);
if (ctx->status != OPENED) {
@@ -216,6 +212,12 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID);
+ /*
+ * Increment driver use count. Enables global TLBIs for hash
+ * and callbacks to handle the segment table
+ */
+ cxl_ctx_get();
+
trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr);
if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor,
@@ -225,6 +227,7 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
put_pid(ctx->glpid);
put_pid(ctx->pid);
ctx->glpid = ctx->pid = NULL;
+ cxl_ctx_put();
goto out;
}
diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
index 62e0dfb5f15b..cc1706a92ace 100644
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -268,7 +268,7 @@ struct cxl_afu *cxl_alloc_afu(struct cxl *adapter, int slice)
idr_init(&afu->contexts_idr);
mutex_init(&afu->contexts_lock);
spin_lock_init(&afu->afu_cntl_lock);
-
+ atomic_set(&afu->configured_state, -1);
afu->prefault_mode = CXL_PREFAULT_NONE;
afu->irqs_max = afu->adapter->user_irqs;
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index a217a74ccc98..224c7103890c 100644
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -1066,13 +1066,16 @@ int cxl_native_register_psl_err_irq(struct cxl *adapter)
void cxl_native_release_psl_err_irq(struct cxl *adapter)
{
- if (adapter->native->err_virq != irq_find_mapping(NULL, adapter->native->err_hwirq))
+ if (adapter->native->err_virq == 0 ||
+ adapter->native->err_virq !=
+ irq_find_mapping(NULL, adapter->native->err_hwirq))
return;
cxl_p1_write(adapter, CXL_PSL_ErrIVTE, 0x0000000000000000);
cxl_unmap_irq(adapter->native->err_virq, adapter);
cxl_ops->release_one_irq(adapter, adapter->native->err_hwirq);
kfree(adapter->irq_name);
+ adapter->native->err_virq = 0;
}
int cxl_native_register_serr_irq(struct cxl_afu *afu)
@@ -1102,13 +1105,15 @@ int cxl_native_register_serr_irq(struct cxl_afu *afu)
void cxl_native_release_serr_irq(struct cxl_afu *afu)
{
- if (afu->serr_virq != irq_find_mapping(NULL, afu->serr_hwirq))
+ if (afu->serr_virq == 0 ||
+ afu->serr_virq != irq_find_mapping(NULL, afu->serr_hwirq))
return;
cxl_p1n_write(afu, CXL_PSL_SERR_An, 0x0000000000000000);
cxl_unmap_irq(afu->serr_virq, afu);
cxl_ops->release_one_irq(afu->adapter, afu->serr_hwirq);
kfree(afu->err_irq_name);
+ afu->serr_virq = 0;
}
int cxl_native_register_psl_irq(struct cxl_afu *afu)
@@ -1131,12 +1136,15 @@ int cxl_native_register_psl_irq(struct cxl_afu *afu)
void cxl_native_release_psl_irq(struct cxl_afu *afu)
{
- if (afu->native->psl_virq != irq_find_mapping(NULL, afu->native->psl_hwirq))
+ if (afu->native->psl_virq == 0 ||
+ afu->native->psl_virq !=
+ irq_find_mapping(NULL, afu->native->psl_hwirq))
return;
cxl_unmap_irq(afu->native->psl_virq, afu);
cxl_ops->release_one_irq(afu->adapter, afu->native->psl_hwirq);
kfree(afu->psl_irq_name);
+ afu->native->psl_virq = 0;
}
static void recover_psl_err(struct cxl_afu *afu, u64 errstat)
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index e96be9ca4e60..eef202d4399b 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1129,6 +1129,7 @@ static int pci_configure_afu(struct cxl_afu *afu, struct cxl *adapter, struct pc
if ((rc = cxl_native_register_psl_irq(afu)))
goto err2;
+ atomic_set(&afu->configured_state, 0);
return 0;
err2:
@@ -1141,6 +1142,14 @@ err1:
static void pci_deconfigure_afu(struct cxl_afu *afu)
{
+ /*
+ * It's okay to deconfigure when AFU is already locked, otherwise wait
+ * until there are no readers
+ */
+ if (atomic_read(&afu->configured_state) != -1) {
+ while (atomic_cmpxchg(&afu->configured_state, 0, -1) != -1)
+ schedule();
+ }
cxl_native_release_psl_irq(afu);
if (afu->adapter->native->sl_ops->release_serr_irq)
afu->adapter->native->sl_ops->release_serr_irq(afu);
@@ -1487,8 +1496,6 @@ static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev)
if ((rc = cxl_native_register_psl_err_irq(adapter)))
goto err;
- /* Release the context lock as adapter is configured */
- cxl_adapter_context_unlock(adapter);
return 0;
err:
@@ -1587,6 +1594,9 @@ static struct cxl *cxl_pci_init_adapter(struct pci_dev *dev)
if ((rc = cxl_sysfs_adapter_add(adapter)))
goto err_put1;
+ /* Release the context lock as adapter is configured */
+ cxl_adapter_context_unlock(adapter);
+
return adapter;
err_put1:
@@ -1610,6 +1620,9 @@ static void cxl_pci_remove_adapter(struct cxl *adapter)
cxl_sysfs_adapter_remove(adapter);
cxl_debugfs_adapter_remove(adapter);
+ /* Flush adapter datacache as its about to be removed */
+ cxl_data_cache_flush(adapter);
+
cxl_deconfigure_adapter(adapter);
device_unregister(&adapter->dev);
@@ -1769,7 +1782,7 @@ static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev,
{
struct cxl *adapter = pci_get_drvdata(pdev);
struct cxl_afu *afu;
- pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET;
+ pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET, afu_result;
int i;
/* At this point, we could still have an interrupt pending.
@@ -1874,16 +1887,26 @@ static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev,
for (i = 0; i < adapter->slices; i++) {
afu = adapter->afu[i];
- result = cxl_vphb_error_detected(afu, state);
-
- /* Only continue if everyone agrees on NEED_RESET */
- if (result != PCI_ERS_RESULT_NEED_RESET)
- return result;
+ afu_result = cxl_vphb_error_detected(afu, state);
cxl_context_detach_all(afu);
cxl_ops->afu_deactivate_mode(afu, afu->current_mode);
pci_deconfigure_afu(afu);
+
+ /* Disconnect trumps all, NONE trumps NEED_RESET */
+ if (afu_result == PCI_ERS_RESULT_DISCONNECT)
+ result = PCI_ERS_RESULT_DISCONNECT;
+ else if ((afu_result == PCI_ERS_RESULT_NONE) &&
+ (result == PCI_ERS_RESULT_NEED_RESET))
+ result = PCI_ERS_RESULT_NONE;
}
+
+ /* should take the context lock here */
+ if (cxl_adapter_context_lock(adapter) != 0)
+ dev_warn(&adapter->dev,
+ "Couldn't take context lock with %d active-contexts\n",
+ atomic_read(&adapter->contexts_num));
+
cxl_deconfigure_adapter(adapter);
return result;
@@ -1902,6 +1925,13 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
if (cxl_configure_adapter(adapter, pdev))
goto err;
+ /*
+ * Unlock context activation for the adapter. Ideally this should be
+ * done in cxl_pci_resume but cxlflash module tries to activate the
+ * master context as part of slot_reset callback.
+ */
+ cxl_adapter_context_unlock(adapter);
+
for (i = 0; i < adapter->slices; i++) {
afu = adapter->afu[i];
diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
index 3519acebfdab..512a4897dbf6 100644
--- a/drivers/misc/cxl/vphb.c
+++ b/drivers/misc/cxl/vphb.c
@@ -76,23 +76,32 @@ static int cxl_pcie_cfg_record(u8 bus, u8 devfn)
return (bus << 8) + devfn;
}
-static int cxl_pcie_config_info(struct pci_bus *bus, unsigned int devfn,
- struct cxl_afu **_afu, int *_record)
+static inline struct cxl_afu *pci_bus_to_afu(struct pci_bus *bus)
{
- struct pci_controller *phb;
- struct cxl_afu *afu;
- int record;
+ struct pci_controller *phb = bus ? pci_bus_to_host(bus) : NULL;
- phb = pci_bus_to_host(bus);
- if (phb == NULL)
- return PCIBIOS_DEVICE_NOT_FOUND;
+ return phb ? phb->private_data : NULL;
+}
+
+static void cxl_afu_configured_put(struct cxl_afu *afu)
+{
+ atomic_dec_if_positive(&afu->configured_state);
+}
+
+static bool cxl_afu_configured_get(struct cxl_afu *afu)
+{
+ return atomic_inc_unless_negative(&afu->configured_state);
+}
+
+static inline int cxl_pcie_config_info(struct pci_bus *bus, unsigned int devfn,
+ struct cxl_afu *afu, int *_record)
+{
+ int record;
- afu = (struct cxl_afu *)phb->private_data;
record = cxl_pcie_cfg_record(bus->number, devfn);
if (record > afu->crs_num)
return PCIBIOS_DEVICE_NOT_FOUND;
- *_afu = afu;
*_record = record;
return 0;
}
@@ -106,9 +115,14 @@ static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
u16 val16;
u32 val32;
- rc = cxl_pcie_config_info(bus, devfn, &afu, &record);
+ afu = pci_bus_to_afu(bus);
+ /* Grab a reader lock on afu. */
+ if (afu == NULL || !cxl_afu_configured_get(afu))
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ rc = cxl_pcie_config_info(bus, devfn, afu, &record);
if (rc)
- return rc;
+ goto out;
switch (len) {
case 1:
@@ -127,10 +141,9 @@ static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
WARN_ON(1);
}
- if (rc)
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- return PCIBIOS_SUCCESSFUL;
+out:
+ cxl_afu_configured_put(afu);
+ return rc ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
}
static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
@@ -139,9 +152,14 @@ static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
int rc, record;
struct cxl_afu *afu;
- rc = cxl_pcie_config_info(bus, devfn, &afu, &record);
+ afu = pci_bus_to_afu(bus);
+ /* Grab a reader lock on afu. */
+ if (afu == NULL || !cxl_afu_configured_get(afu))
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ rc = cxl_pcie_config_info(bus, devfn, afu, &record);
if (rc)
- return rc;
+ goto out;
switch (len) {
case 1:
@@ -157,10 +175,9 @@ static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
WARN_ON(1);
}
- if (rc)
- return PCIBIOS_SET_FAILED;
-
- return PCIBIOS_SUCCESSFUL;
+out:
+ cxl_afu_configured_put(afu);
+ return rc ? PCIBIOS_SET_FAILED : PCIBIOS_SUCCESSFUL;
}
static struct pci_ops cxl_pcie_pci_ops =
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 051b14766ef9..19c10dc56513 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -365,7 +365,8 @@ static ssize_t at24_eeprom_read_mac(struct at24_data *at24, char *buf,
memset(msg, 0, sizeof(msg));
msg[0].addr = client->addr;
msg[0].buf = addrbuf;
- addrbuf[0] = 0x90 + offset;
+ /* EUI-48 starts from 0x9a, EUI-64 from 0x98 */
+ addrbuf[0] = 0xa0 - at24->chip.byte_len + offset;
msg[0].len = 1;
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
@@ -506,6 +507,9 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
if (unlikely(!count))
return count;
+ if (off + count > at24->chip.byte_len)
+ return -EINVAL;
+
/*
* Read data from chip, protecting against concurrent updates
* from this host, but not from other I2C masters.
@@ -538,6 +542,9 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
if (unlikely(!count))
return -EINVAL;
+ if (off + count > at24->chip.byte_len)
+ return -EINVAL;
+
/*
* Write data to chip, protecting against concurrent updates
* from this host, but not from other I2C masters.
@@ -638,6 +645,16 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
dev_warn(&client->dev,
"page_size looks suspicious (no power of 2)!\n");
+ /*
+ * REVISIT: the size of the EUI-48 byte array is 6 in at24mac402, while
+ * the call to ilog2() in AT24_DEVICE_MAGIC() rounds it down to 4.
+ *
+ * Eventually we'll get rid of the magic values altoghether in favor of
+ * real structs, but for now just manually set the right size.
+ */
+ if (chip.flags & AT24_FLAG_MAC && chip.byte_len == 4)
+ chip.byte_len = 6;
+
/* Use I2C operations unless we're stuck with SMBus extensions. */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
if (chip.flags & AT24_FLAG_ADDR16)
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
index 65fed7146e9b..cc91f7b3d90c 100644
--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -375,6 +375,7 @@ int enclosure_add_device(struct enclosure_device *edev, int component,
struct device *dev)
{
struct enclosure_component *cdev;
+ int err;
if (!edev || component >= edev->components)
return -EINVAL;
@@ -384,12 +385,17 @@ int enclosure_add_device(struct enclosure_device *edev, int component,
if (cdev->dev == dev)
return -EEXIST;
- if (cdev->dev)
+ if (cdev->dev) {
enclosure_remove_links(cdev);
-
- put_device(cdev->dev);
+ put_device(cdev->dev);
+ }
cdev->dev = get_device(dev);
- return enclosure_add_links(cdev);
+ err = enclosure_add_links(cdev);
+ if (err) {
+ put_device(cdev->dev);
+ cdev->dev = NULL;
+ }
+ return err;
}
EXPORT_SYMBOL_GPL(enclosure_add_device);
diff --git a/drivers/misc/lkdtm_core.c b/drivers/misc/lkdtm_core.c
index f9154b8d67f6..b2989f2d3126 100644
--- a/drivers/misc/lkdtm_core.c
+++ b/drivers/misc/lkdtm_core.c
@@ -533,7 +533,9 @@ static void __exit lkdtm_module_exit(void)
/* Handle test-specific clean-up. */
lkdtm_usercopy_exit();
- unregister_jprobe(lkdtm_jprobe);
+ if (lkdtm_jprobe != NULL)
+ unregister_jprobe(lkdtm_jprobe);
+
pr_info("Crash point unregistered\n");
}
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index dbe676de7a19..0c98ed44df05 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -678,8 +678,10 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
{
struct mei_cl_device *cldev = to_mei_cl_device(dev);
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
+ u8 version = mei_me_cl_ver(cldev->me_cl);
- return scnprintf(buf, PAGE_SIZE, "mei:%s:%pUl:", cldev->name, uuid);
+ return scnprintf(buf, PAGE_SIZE, "mei:%s:%pUl:%02X:",
+ cldev->name, uuid, version);
}
static DEVICE_ATTR_RO(modalias);
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index e2af61f7e3b6..451d417eb451 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1320,6 +1320,9 @@ int mei_cl_notify_request(struct mei_cl *cl,
return -EOPNOTSUPP;
}
+ if (!mei_cl_is_connected(cl))
+ return -ENODEV;
+
rets = pm_runtime_get(dev->dev);
if (rets < 0 && rets != -EINPROGRESS) {
pm_runtime_put_noidle(dev->dev);
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index fa50635512e8..41f318631c6d 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -182,32 +182,36 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
goto out;
}
- if (rets == -EBUSY &&
- !mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, file)) {
- rets = -ENOMEM;
- goto out;
- }
- do {
- mutex_unlock(&dev->device_lock);
-
- if (wait_event_interruptible(cl->rx_wait,
- (!list_empty(&cl->rd_completed)) ||
- (!mei_cl_is_connected(cl)))) {
+again:
+ mutex_unlock(&dev->device_lock);
+ if (wait_event_interruptible(cl->rx_wait,
+ !list_empty(&cl->rd_completed) ||
+ !mei_cl_is_connected(cl))) {
+ if (signal_pending(current))
+ return -EINTR;
+ return -ERESTARTSYS;
+ }
+ mutex_lock(&dev->device_lock);
- if (signal_pending(current))
- return -EINTR;
- return -ERESTARTSYS;
- }
+ if (!mei_cl_is_connected(cl)) {
+ rets = -ENODEV;
+ goto out;
+ }
- mutex_lock(&dev->device_lock);
- if (!mei_cl_is_connected(cl)) {
- rets = -ENODEV;
- goto out;
- }
+ cb = mei_cl_read_cb(cl, file);
+ if (!cb) {
+ /*
+ * For amthif all the waiters are woken up,
+ * but only fp with matching cb->fp get the cb,
+ * the others have to return to wait on read.
+ */
+ if (cl == &dev->iamthif_cl)
+ goto again;
- cb = mei_cl_read_cb(cl, file);
- } while (!cb);
+ rets = 0;
+ goto out;
+ }
copy_buffer:
/* now copy the data to user space */
diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c
index 88e45234d527..fed992e2c258 100644
--- a/drivers/misc/mic/vop/vop_vringh.c
+++ b/drivers/misc/mic/vop/vop_vringh.c
@@ -292,7 +292,6 @@ static int vop_virtio_add_device(struct vop_vdev *vdev,
if (ret) {
dev_err(vop_dev(vdev), "%s %d err %d\n",
__func__, __LINE__, ret);
- kfree(vdev);
return ret;
}
diff --git a/drivers/misc/panel.c b/drivers/misc/panel.c
index 6030ac5b8c63..a9fa4c0ac220 100644
--- a/drivers/misc/panel.c
+++ b/drivers/misc/panel.c
@@ -1423,17 +1423,25 @@ static ssize_t lcd_write(struct file *file,
static int lcd_open(struct inode *inode, struct file *file)
{
+ int ret;
+
+ ret = -EBUSY;
if (!atomic_dec_and_test(&lcd_available))
- return -EBUSY; /* open only once at a time */
+ goto fail; /* open only once at a time */
+ ret = -EPERM;
if (file->f_mode & FMODE_READ) /* device is write-only */
- return -EPERM;
+ goto fail;
if (lcd.must_clear) {
lcd_clear_display();
lcd.must_clear = false;
}
return nonseekable_open(inode, file);
+
+ fail:
+ atomic_inc(&lcd_available);
+ return ret;
}
static int lcd_release(struct inode *inode, struct file *file)
@@ -1696,14 +1704,21 @@ static ssize_t keypad_read(struct file *file,
static int keypad_open(struct inode *inode, struct file *file)
{
+ int ret;
+
+ ret = -EBUSY;
if (!atomic_dec_and_test(&keypad_available))
- return -EBUSY; /* open only once at a time */
+ goto fail; /* open only once at a time */
+ ret = -EPERM;
if (file->f_mode & FMODE_WRITE) /* device is read-only */
- return -EPERM;
+ goto fail;
keypad_buflen = 0; /* flush the buffer on opening */
return 0;
+ fail:
+ atomic_inc(&keypad_available);
+ return ret;
}
static int keypad_release(struct inode *inode, struct file *file)
generated by cgit v1.2.3 (git 2.0.4) at 2025-01-15 00:00:08 +0000