kernel: disable cfi cmdset 0002 erase suspend
authorFelix Fietkau <nbd@openwrt.org>
Mon, 15 Aug 2011 00:15:36 +0000 (00:15 +0000)
committerFelix Fietkau <nbd@openwrt.org>
Mon, 15 Aug 2011 00:15:36 +0000 (00:15 +0000)
on some platforms, erase suspend leads to data corruption and lockups when write
ops collide with erase ops. this has been observed on the buffalo wzr-hp-g300nh.
rather than play whack-a-mole with a hard to reproduce issue on a variety of devices,
simply disable erase suspend, as it will usually not produce any useful gain on
the small filesystems used on embedded hardware.

SVN-Revision: 27984

target/linux/generic/patches-2.6.39/461-cfi_cmdset_0002_no_erase_suspend.patch [new file with mode: 0644]
target/linux/generic/patches-3.0/460-cfi_cmdset_0002_no_erase_suspend.patch [new file with mode: 0644]
target/linux/generic/patches-3.1/460-cfi_cmdset_0002_no_erase_suspend.patch [new file with mode: 0644]

diff --git a/target/linux/generic/patches-2.6.39/461-cfi_cmdset_0002_no_erase_suspend.patch b/target/linux/generic/patches-2.6.39/461-cfi_cmdset_0002_no_erase_suspend.patch
new file mode 100644 (file)
index 0000000..d7b44ef
--- /dev/null
@@ -0,0 +1,11 @@
+--- a/drivers/mtd/chips/cfi_cmdset_0002.c
++++ b/drivers/mtd/chips/cfi_cmdset_0002.c
+@@ -684,7 +684,7 @@ static int get_chip(struct map_info *map
+               return 0;
+       case FL_ERASING:
+-              if (!cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
++              if (1 /* no suspend */ || !cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
+                   !(mode == FL_READY || mode == FL_POINT ||
+                   (mode == FL_WRITING && (cfip->EraseSuspend & 0x2))))
+                       goto sleep;
diff --git a/target/linux/generic/patches-3.0/460-cfi_cmdset_0002_no_erase_suspend.patch b/target/linux/generic/patches-3.0/460-cfi_cmdset_0002_no_erase_suspend.patch
new file mode 100644 (file)
index 0000000..04ef193
--- /dev/null
@@ -0,0 +1,11 @@
+--- a/drivers/mtd/chips/cfi_cmdset_0002.c
++++ b/drivers/mtd/chips/cfi_cmdset_0002.c
+@@ -685,7 +685,7 @@ static int get_chip(struct map_info *map
+               return 0;
+       case FL_ERASING:
+-              if (!cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
++              if (1 /* no suspend */ || !cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
+                   !(mode == FL_READY || mode == FL_POINT ||
+                   (mode == FL_WRITING && (cfip->EraseSuspend & 0x2))))
+                       goto sleep;
diff --git a/target/linux/generic/patches-3.1/460-cfi_cmdset_0002_no_erase_suspend.patch b/target/linux/generic/patches-3.1/460-cfi_cmdset_0002_no_erase_suspend.patch
new file mode 100644 (file)
index 0000000..04ef193
--- /dev/null
@@ -0,0 +1,11 @@
+--- a/drivers/mtd/chips/cfi_cmdset_0002.c
++++ b/drivers/mtd/chips/cfi_cmdset_0002.c
+@@ -685,7 +685,7 @@ static int get_chip(struct map_info *map
+               return 0;
+       case FL_ERASING:
+-              if (!cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
++              if (1 /* no suspend */ || !cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
+                   !(mode == FL_READY || mode == FL_POINT ||
+                   (mode == FL_WRITING && (cfip->EraseSuspend & 0x2))))
+                       goto sleep;