evie/android_kernel_oneplus_msm8998
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msm: ais: Make use of mutex lock to avoid race condition

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Make use of mutex lock to access IOCTL so that two threads
can avoid race condition.

Change-Id: I3650affa0577b30531160e1d11c57d13baf34c2f
CRs-Fixed: 2060377
Signed-off-by: Rahul Sharma <sharah@codeaurora.org>
This commit is contained in:
Rahul Sharma 2017-08-02 10:17:42 +05:30 • committed by Andy Sun
parent 03f28c162d
commit 407c4c300b
1 changed files with 5 additions and 1 deletions
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6
drivers/media/platform/msm/ais/fd/msm_fd_dev.c
View file

@ -1053,14 +1053,18 @@ static int msm_fd_s_ctrl(struct file *file, void *fh, struct v4l2_control *a)
a->value = ctx->format.size->work_size;
break;
case V4L2_CID_FD_WORK_MEMORY_FD:
mutex_lock(&ctx->fd_device->recovery_lock);
if (ctx->work_buf.fd != -1)
msm_fd_hw_unmap_buffer(&ctx->work_buf);
if (a->value >= 0) {
ret = msm_fd_hw_map_buffer(&ctx->mem_pool,
a->value, &ctx->work_buf);
if (ret < 0)
if (ret < 0) {
mutex_unlock(&ctx->fd_device->recovery_lock);
return ret;
}
}
mutex_unlock(&ctx->fd_device->recovery_lock);
break;
default:
return -EINVAL;