diff options
| author | Lijun Pan <ljp@linux.ibm.com> | 2021-01-27 19:34:42 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-07 15:37:12 +0100 |
| commit | 3766a00d765dca6e2c05b18ab95c39fb2d00802c (patch) | |
| tree | 8b34a0cf4a8d0b2ab1c61c3fe02e57c9a0607e98 /drivers/net/ethernet/ibm | |
| parent | c71bfc5f13c363cbf03a4623b8bf2836d321a4ff (diff) | |
ibmvnic: Ensure that CRQ entry read are correctly ordered
commit e41aec79e62fa50f940cf222d1e9577f14e149dc upstream.
Ensure that received Command-Response Queue (CRQ) entries are
properly read in order by the driver. dma_rmb barrier has
been added before accessing the CRQ descriptor to ensure
the entire descriptor is read before processing.
Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
Link: https://lore.kernel.org/r/20210128013442.88319-1-ljp@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/ethernet/ibm')
| -rw-r--r-- | drivers/net/ethernet/ibm/ibmvnic.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index e2540cc00d34..627ce1a20473 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -4979,6 +4979,12 @@ static void ibmvnic_tasklet(struct tasklet_struct *t) while (!done) { /* Pull all the valid messages off the CRQ */ while ((crq = ibmvnic_next_crq(adapter)) != NULL) { + /* This barrier makes sure ibmvnic_next_crq()'s + * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded + * before ibmvnic_handle_crq()'s + * switch(gen_crq->first) and switch(gen_crq->cmd). + */ + dma_rmb(); ibmvnic_handle_crq(crq, adapter); crq->generic.first = 0; } |