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f5919b65d4
Patch generation process: - rebase rpi/rpi-4.14.y on v4.14.89 from linux-stable - git format-patch v4.14.89 Patches skipped during rebase: - lan78xx: Read MAC address from DT if present - lan78xx: Enable LEDs and auto-negotiation - Revert "softirq: Let ksoftirqd do its job" - sc16is7xx: Fix for multi-channel stall - lan78xx: Ignore DT MAC address if already valid - lan78xx: Simple patch to prevent some crashes - tcp_write_queue_purge clears all the SKBs in the write queue - Revert "lan78xx: Simple patch to prevent some crashes" - lan78xx: Connect phy early - Arm: mm: ftrace: Only set text back to ro after kernel has been marked ro - Revert "Revert "softirq: Let ksoftirqd do its job"" - ASoC: cs4265: SOC_SINGLE register value error fix - Revert "ASoC: cs4265: SOC_SINGLE register value error fix" - Revert "net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends" - Revert "Revert "net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends"" Patches dropped after rebase: - net: Add non-mainline source for rtl8192cu wlan - net: Fix rtl8192cu build errors on other platforms - brcm: adds support for BCM43341 wifi - brcmfmac: Mute expected startup 'errors' - ARM64: Fix build break for RTL8187/RTL8192CU wifi - ARM64: Enable RTL8187/RTL8192CU wifi in build config - This is the driver for Sony CXD2880 DVB-T2/T tuner + demodulator - brcmfmac: add CLM download support - brcmfmac: request_firmware_direct is quieter - Sets the BCDC priority to constant 0 - brcmfmac: Disable ARP offloading when promiscuous - brcmfmac: Avoid possible out-of-bounds read - brcmfmac: Delete redundant length check - net: rtl8192cu: Normalize indentation - net: rtl8192cu: Fix implicit fallthrough warnings - Revert "Sets the BCDC priority to constant 0" - media: cxd2880: Bump to match 4.18.y version - media: cxd2880-spi: Bump to match 4.18.y version - Revert "mm: alloc_contig: re-allow CMA to compact FS pages" - Revert "Revert "mm: alloc_contig: re-allow CMA to compact FS pages"" - cxd2880: CXD2880_SPI_DRV should select DVB_CXD2880 with MEDIA_SUBDRV_AUTOSELECT - 950-0421-HID-hid-bigbenff-driver-for-BigBen-Interactive-PS3OF.patch - 950-0453-Add-hid-bigbenff-to-list-of-have_special_driver-for-.patch Make I2C built-in instead of modular as in upstream defconfig; also the easiest way to get MFD_ARIZONA enabled, which is required by kmod-sound-soc-rpi-cirrus. Add missing compatible strings from 4.9/960-add-rasbperrypi-compatible.patch, using upstream names for compute modules. Add extra patch to enable the LEDs on lan78xx. Compile-tested: bcm2708, bcm2709, bcm2710 (with CONFIG_ALL_KMODS=y) Runtime-tested: bcm2708, bcm2710 Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
42 lines
1.8 KiB
Diff
42 lines
1.8 KiB
Diff
From 5537bac0e5c8f3634c5595c21c7d63f0c0263e0e Mon Sep 17 00:00:00 2001
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From: Boris Brezillon <boris.brezillon@free-electrons.com>
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Date: Wed, 22 Nov 2017 21:39:28 +0100
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Subject: [PATCH 175/454] drm/vc4: Fix false positive WARN() backtrace on
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refcount_inc() usage
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With CONFIG_REFCOUNT_FULL enabled, refcount_inc() complains when it's
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passed a refcount object that has its counter set to 0. In this driver,
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this is a valid use case since we want to increment ->usecnt only when
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the BO object starts to be used by real HW components and this is
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definitely not the case when the BO is created.
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Fix the problem by using refcount_inc_not_zero() instead of
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refcount_inc() and fallback to refcount_set(1) when
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refcount_inc_not_zero() returns false. Note that this 2-steps operation
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is not racy here because the whole section is protected by a mutex
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which guarantees that the counter does not change between the
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refcount_inc_not_zero() and refcount_set() calls.
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Fixes: b9f19259b84d ("drm/vc4: Add the DRM_IOCTL_VC4_GEM_MADVISE ioctl")
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Reported-by: Stefan Wahren <stefan.wahren@i2se.com>
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Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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Acked-by: Eric Anholt <eric@anholt.net>
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Link: https://patchwork.freedesktop.org/patch/msgid/20171122203928.28135-1-boris.brezillon@free-electrons.com
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(cherry picked from commit 5bfd40139d55790cbc8e56ad1ce4f974f1fa186d)
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---
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drivers/gpu/drm/vc4/vc4_bo.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/drivers/gpu/drm/vc4/vc4_bo.c
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+++ b/drivers/gpu/drm/vc4/vc4_bo.c
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@@ -639,7 +639,8 @@ int vc4_bo_inc_usecnt(struct vc4_bo *bo)
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mutex_lock(&bo->madv_lock);
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switch (bo->madv) {
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case VC4_MADV_WILLNEED:
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- refcount_inc(&bo->usecnt);
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+ if (!refcount_inc_not_zero(&bo->usecnt))
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+ refcount_set(&bo->usecnt, 1);
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ret = 0;
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break;
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case VC4_MADV_DONTNEED:
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