[4.9,122/130,media] s5p-mfc: Fix clock management in s5p_mfc_release() function
diff mbox series

Message ID 20170124075539.929255921@linuxfoundation.org
State New, archived
Headers show
Series
  • 4.9.6-stable review
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Commit Message

Greg KH Jan. 24, 2017, 7:56 a.m. UTC
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprowski@samsung.com>

commit c0026c7bfb95c250c3e34fde59f96ad72fd730d6 upstream.

Clock control indirectly requires access to MFC device, so call it only
if we are sure that the device exists in s5p_mfc_release function.
s5p_mfc_remove() calls s5p_mfc_final_pm(), which releases all PM related
resources, including clocks, so any call to clocks related functions
is not valid after s5p_mfc_final_pm().

Fixes: d695c12 ("[media] media: s5p-mfc fix invalid memory access from
s5p_mfc_release()")

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/platform/s5p-mfc/s5p_mfc.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Patch
diff mbox series

--- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
@@ -926,10 +926,11 @@  static int s5p_mfc_release(struct file *
 	mfc_debug_enter();
 	if (dev)
 		mutex_lock(&dev->mfc_mutex);
-	s5p_mfc_clock_on();
 	vb2_queue_release(&ctx->vq_src);
 	vb2_queue_release(&ctx->vq_dst);
 	if (dev) {
+		s5p_mfc_clock_on();
+
 		/* Mark context as idle */
 		clear_work_bit_irqsave(ctx);
 		/*
@@ -951,9 +952,9 @@  static int s5p_mfc_release(struct file *
 			if (s5p_mfc_power_off() < 0)
 				mfc_err("Power off failed\n");
 		}
+		mfc_debug(2, "Shutting down clock\n");
+		s5p_mfc_clock_off();
 	}
-	mfc_debug(2, "Shutting down clock\n");
-	s5p_mfc_clock_off();
 	if (dev)
 		dev->ctx[ctx->num] = NULL;
 	s5p_mfc_dec_ctrls_delete(ctx);