diff options
| -rw-r--r-- | mm/process_vm_access.c | 29 |
1 files changed, 13 insertions, 16 deletions
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index 40dfb396e8ab..4bbd495fcedd 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -46,8 +46,7 @@ static int process_vm_rw_pages(struct task_struct *task, unsigned long start_offset, unsigned long len, const struct iovec **iovp, - unsigned long lvec_cnt, - unsigned long *lvec_current, + unsigned long *left, size_t *lvec_offset, int vm_write, unsigned int nr_pages_to_copy, @@ -78,15 +77,14 @@ static int process_vm_rw_pages(struct task_struct *task, /* Do the copy for each page */ for (pgs_copied = 0; - (pgs_copied < nr_pages_to_copy) && (*lvec_current < lvec_cnt); + (pgs_copied < nr_pages_to_copy) && *left; pgs_copied++) { /* Make sure we have a non zero length iovec */ - while (*lvec_current < lvec_cnt - && iov->iov_len == 0) { + while (*left && iov->iov_len == 0) { iov++; - (*lvec_current)++; + (*left)--; } - if (*lvec_current == lvec_cnt) + if (!*left) break; /* @@ -125,7 +123,7 @@ static int process_vm_rw_pages(struct task_struct *task, * Need to copy remaining part of page into the * next iovec if there are any bytes left in page */ - (*lvec_current)++; + (*left)--; iov++; *lvec_offset = 0; start_offset = (start_offset + bytes_to_copy) @@ -175,8 +173,7 @@ end: static int process_vm_rw_single_vec(unsigned long addr, unsigned long len, const struct iovec **iovp, - unsigned long lvec_cnt, - unsigned long *lvec_current, + unsigned long *left, size_t *lvec_offset, struct page **process_pages, struct mm_struct *mm, @@ -201,14 +198,14 @@ static int process_vm_rw_single_vec(unsigned long addr, return 0; nr_pages = (addr + len - 1) / PAGE_SIZE - addr / PAGE_SIZE + 1; - while ((nr_pages_copied < nr_pages) && (*lvec_current < lvec_cnt)) { + while ((nr_pages_copied < nr_pages) && *left) { nr_pages_to_copy = min(nr_pages - nr_pages_copied, max_pages_per_loop); rc = process_vm_rw_pages(task, mm, process_pages, pa, start_offset, len, - iovp, lvec_cnt, - lvec_current, lvec_offset, + iovp, left, + lvec_offset, vm_write, nr_pages_to_copy, &bytes_copied_loop); start_offset = 0; @@ -259,7 +256,7 @@ static ssize_t process_vm_rw_core(pid_t pid, const struct iovec *lvec, ssize_t bytes_copied = 0; unsigned long nr_pages = 0; unsigned long nr_pages_iov; - unsigned long iov_l_curr_idx = 0; + unsigned long left = liovcnt; size_t iov_l_curr_offset = 0; ssize_t iov_len; @@ -315,10 +312,10 @@ static ssize_t process_vm_rw_core(pid_t pid, const struct iovec *lvec, goto put_task_struct; } - for (i = 0; i < riovcnt && iov_l_curr_idx < liovcnt; i++) { + for (i = 0; i < riovcnt && left; i++) { rc = process_vm_rw_single_vec( (unsigned long)rvec[i].iov_base, rvec[i].iov_len, - &lvec, liovcnt, &iov_l_curr_idx, &iov_l_curr_offset, + &lvec, &left, &iov_l_curr_offset, process_pages, mm, task, vm_write, &bytes_copied_loop); bytes_copied += bytes_copied_loop; if (rc != 0) { |