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[media] s5p-jpeg: fix recursive spinlock acquisition

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v4l2_m2m_job_finish(), which is called from the interrupt handler with
slock acquired, can call the device_run() hook immediately if another
context was in the queue. This hook also acquires slock, resulting in
a deadlock for this scenario.

Fix this by releasing slock right before calling v4l2_m2m_job_finish().
This is safe to do as the state of the hardware cannot change before
v4l2_m2m_job_finish() is called anyway.

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Alexandre Courbot 2017-04-25 03:19:43 -03:00 committed by Mauro Carvalho Chehab
parent 18726a349d
commit 17d716e926
1 changed files with 9 additions and 3 deletions
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12
drivers/media/platform/s5p-jpeg/jpeg-core.c
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@ -2642,13 +2642,13 @@ static irqreturn_t s5p_jpeg_irq(int irq, void *dev_id)
if (curr_ctx->mode == S5P_JPEG_ENCODE)
vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload_size);
v4l2_m2m_buf_done(dst_buf, state);
v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
curr_ctx->subsampling = s5p_jpeg_get_subsampling_mode(jpeg->regs);
spin_unlock(&jpeg->slock);
s5p_jpeg_clear_int(jpeg->regs);
v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
return IRQ_HANDLED;
}
@ -2707,11 +2707,12 @@ static irqreturn_t exynos4_jpeg_irq(int irq, void *priv)
v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_ERROR);
}
v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
if (jpeg->variant->version == SJPEG_EXYNOS4)
curr_ctx->subsampling = exynos4_jpeg_get_frame_fmt(jpeg->regs);
spin_unlock(&jpeg->slock);
v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
return IRQ_HANDLED;
}
@ -2770,10 +2771,15 @@ static irqreturn_t exynos3250_jpeg_irq(int irq, void *dev_id)
if (curr_ctx->mode == S5P_JPEG_ENCODE)
vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload_size);
v4l2_m2m_buf_done(dst_buf, state);
v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
curr_ctx->subsampling =
exynos3250_jpeg_get_subsampling_mode(jpeg->regs);
spin_unlock(&jpeg->slock);
v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
return IRQ_HANDLED;
exit_unlock:
spin_unlock(&jpeg->slock);
return IRQ_HANDLED;