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Message-Id: <1408354398-10226-76-git-send-email-luis.henriques@canonical.com> Date: Mon, 18 Aug 2014 10:32:16 +0100 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Christian König <christian.koenig@....com>, Alex Deucher <alexander.deucher@....com>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.11 075/137] drm/radeon: fix irq ring buffer overflow handling 3.11.10.15 -stable review patch. If anyone has any objections, please let me know. ------------------ From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@....com> commit e8c214d22e76dd0ead38f97f8d2dc09aac70d651 upstream. We must mask out the overflow bit as well, otherwise the wptr will never match the rptr again and the interrupt handler will loop forever. Signed-off-by: Christian König <christian.koenig@....com> Signed-off-by: Alex Deucher <alexander.deucher@....com> Reviewed-by: Michel Dänzer <michel.daenzer@....com> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- drivers/gpu/drm/radeon/cik.c | 1 + drivers/gpu/drm/radeon/evergreen.c | 1 + drivers/gpu/drm/radeon/r600.c | 1 + drivers/gpu/drm/radeon/si.c | 1 + 4 files changed, 4 insertions(+) diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index 85647ab99fb1..0aaaa11b7036 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -5591,6 +5591,7 @@ static inline u32 cik_get_ih_wptr(struct radeon_device *rdev) tmp = RREG32(IH_RB_CNTL); tmp |= IH_WPTR_OVERFLOW_CLEAR; WREG32(IH_RB_CNTL, tmp); + wptr &= ~RB_OVERFLOW; } return (wptr & rdev->ih.ptr_mask); } diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c index a34e20921711..415ab58594d9 100644 --- a/drivers/gpu/drm/radeon/evergreen.c +++ b/drivers/gpu/drm/radeon/evergreen.c @@ -4597,6 +4597,7 @@ static u32 evergreen_get_ih_wptr(struct radeon_device *rdev) tmp = RREG32(IH_RB_CNTL); tmp |= IH_WPTR_OVERFLOW_CLEAR; WREG32(IH_RB_CNTL, tmp); + wptr &= ~RB_OVERFLOW; } return (wptr & rdev->ih.ptr_mask); } diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index 33b35c9e82be..af588cf27293 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -4429,6 +4429,7 @@ static u32 r600_get_ih_wptr(struct radeon_device *rdev) tmp = RREG32(IH_RB_CNTL); tmp |= IH_WPTR_OVERFLOW_CLEAR; WREG32(IH_RB_CNTL, tmp); + wptr &= ~RB_OVERFLOW; } return (wptr & rdev->ih.ptr_mask); } diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c index 3479145e8f47..5a46e269e5d5 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -6052,6 +6052,7 @@ static inline u32 si_get_ih_wptr(struct radeon_device *rdev) tmp = RREG32(IH_RB_CNTL); tmp |= IH_WPTR_OVERFLOW_CLEAR; WREG32(IH_RB_CNTL, tmp); + wptr &= ~RB_OVERFLOW; } return (wptr & rdev->ih.ptr_mask); } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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