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authorMasafumi UTSUGI <mutsugi@allied-telesis.co.jp>2019-10-01 18:59:18 +0900
committerChristian Lamparter <chunkeey@gmail.com>2019-10-20 13:01:43 +0200
commitf1d761f95e9664a9c11ce1b98f9e121b43c79d35 (patch)
treec79b16bb72ab9a9e9b28cfe2dfe5021a55114104 /target/linux/ipq40xx/patches-4.19
parentf5c7fe2ff0deb20f76b4d65195434e35cbb4e08a (diff)
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ipq40xx: essedma: Fix dead lock
edma_read_append_stats() gets called from two places in the driver. The first place is the kernel timer that periodically updates the statistics, so nothing gets lost due to overflows. The second one it's part of the userspace ethtool ioctl handler to provide up-to-date values. For this configuration, the use of spin_lock() is not sufficient and as per: <https://mirrors.edge.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/c214.html> the locking has to be upgraded to spin_lock_bh(). Signed-off-by: Masafumi UTSUGI <mutsugi@allied-telesis.co.jp> [folded patch into 710-, rewrote message] Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Diffstat (limited to 'target/linux/ipq40xx/patches-4.19')
-rw-r--r--target/linux/ipq40xx/patches-4.19/710-net-add-qualcomm-essedma-ethernet-driver.patch4
1 files changed, 2 insertions, 2 deletions
diff --git a/target/linux/ipq40xx/patches-4.19/710-net-add-qualcomm-essedma-ethernet-driver.patch b/target/linux/ipq40xx/patches-4.19/710-net-add-qualcomm-essedma-ethernet-driver.patch
index 9fe3a1a9d6..6ccf2cd480 100644
--- a/target/linux/ipq40xx/patches-4.19/710-net-add-qualcomm-essedma-ethernet-driver.patch
+++ b/target/linux/ipq40xx/patches-4.19/710-net-add-qualcomm-essedma-ethernet-driver.patch
@@ -2774,7 +2774,7 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+ int i;
+ u32 stat;
+
-+ spin_lock(&edma_cinfo->stats_lock);
++ spin_lock_bh(&edma_cinfo->stats_lock);
+ p = (uint32_t *)&(edma_cinfo->edma_ethstats);
+
+ for (i = 0; i < EDMA_MAX_TRANSMIT_QUEUE; i++) {
@@ -2801,7 +2801,7 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+ p++;
+ }
+
-+ spin_unlock(&edma_cinfo->stats_lock);
++ spin_unlock_bh(&edma_cinfo->stats_lock);
+}
+
+static void edma_statistics_timer(struct timer_list *t)