linux-kernel - [PATCH] staging: bcm2835-camera: Avoid apotential sleep while holding a spin

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Message-Id: <20190624053351.5217-1-christophe.jaillet@wanadoo.fr>
Date:   Mon, 24 Jun 2019 07:33:51 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     eric@...olt.net, stefan.wahren@...e.com,
        gregkh@...uxfoundation.org, f.fainelli@...il.com,
        rjui@...adcom.com, sbranden@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com, tuomas.tynkkynen@....fi,
        inf.braun@....de, tobias.buettner@....de, hofrat@...dl.org
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] staging: bcm2835-camera: Avoid apotential sleep while holding a spin_lock

Do not allocate memory with GFP_KERNEL when holding a spin_lock, it may
sleep. Use GFP_NOWAIT instead.

Fixes: 950fd867c635 ("staging: bcm2835-camera: Replace open-coded idr with a struct idr.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
index 16af735af5c3..438d548c6e24 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
@@ -186,7 +186,7 @@ get_msg_context(struct vchiq_mmal_instance *instance)
 	 */
 	spin_lock(&instance->context_map_lock);
 	handle = idr_alloc(&instance->context_map, msg_context,
-			   0, 0, GFP_KERNEL);
+			   0, 0, GFP_NOWAIT);
 	spin_unlock(&instance->context_map_lock);
 
 	if (handle < 0) {
-- 
2.20.1