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Commit c2061739 authored by Krupal Divvela's avatar Krupal Divvela Committed by Gerrit - the friendly Code Review server
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msm: camera: Use mutex lock to avoid race condition 



Use mutex lock before using queuing ioctls like
queuing, dequeing buffers to avoid race condition.

Change-Id: Ia9fdfd5a766add2f8d99003b0c2bfe7d34d57a09
Signed-off-by: default avatarKrupal Divvela <kdivvela@codeaurora.org>
parent 17ca958b

drivers/media/platform/msm/camera_v2/fd/msm_fd_dev.c

+16 −3
Original line number Diff line number Diff line
@@ -749,9 +749,13 @@ static int msm_fd_s_fmt_vid_out(struct file *file, 
static int msm_fd_reqbufs(struct file *file,

	void *fh, struct v4l2_requestbuffers *req)

{

	int ret;

	struct fd_ctx *ctx = msm_fd_ctx_from_fh(fh);



	return vb2_reqbufs(&ctx->vb2_q, req);

	mutex_lock(&ctx->fd_device->recovery_lock);

	ret = vb2_reqbufs(&ctx->vb2_q, req);

	mutex_unlock(&ctx->fd_device->recovery_lock);

	return ret;

}



/*
@@ -763,9 +767,14 @@ static int msm_fd_reqbufs(struct file *file, 
static int msm_fd_qbuf(struct file *file, void *fh,

	struct v4l2_buffer *pb)

{

	int ret;

	struct fd_ctx *ctx = msm_fd_ctx_from_fh(fh);



	return vb2_qbuf(&ctx->vb2_q, pb);

	mutex_lock(&ctx->fd_device->recovery_lock);

	ret = vb2_qbuf(&ctx->vb2_q, pb);

	mutex_unlock(&ctx->fd_device->recovery_lock);

	return ret;



}



/*
@@ -777,9 +786,13 @@ static int msm_fd_qbuf(struct file *file, void *fh, 
static int msm_fd_dqbuf(struct file *file,

	void *fh, struct v4l2_buffer *pb)

{

	int ret;

	struct fd_ctx *ctx = msm_fd_ctx_from_fh(fh);



	return vb2_dqbuf(&ctx->vb2_q, pb, file->f_flags & O_NONBLOCK);

	mutex_lock(&ctx->fd_device->recovery_lock);

	ret = vb2_dqbuf(&ctx->vb2_q, pb, file->f_flags & O_NONBLOCK);

	mutex_unlock(&ctx->fd_device->recovery_lock);

	return ret;

}



/*