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authorFelix Fietkau <nbd@openwrt.org>2009-07-18 00:36:13 +0000
committerFelix Fietkau <nbd@openwrt.org>2009-07-18 00:36:13 +0000
commitaf6076273a89480a3ae8b3893999c170c9a26889 (patch)
treefe384d19240f9c84d103a86eaecd9a2dfb271ec8 /target/linux/generic-2.6/patches-2.6.30
parent12b429b3a22e870677c36d758f1874933f9a572c (diff)
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mtk-20170518-af6076273a89480a3ae8b3893999c170c9a26889.tar.gz
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fix lock-up issues in lzma pcomp support in 2.6.30 (used in squashfs). thanks to jeff hansen for the patch
SVN-Revision: 16886
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.30')
-rw-r--r--target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch57
1 files changed, 34 insertions, 23 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch b/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
index 3259db4..5a5b24f 100644
--- a/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
+++ b/target/linux/generic-2.6/patches-2.6.30/052-pcomp_lzma_support.patch
@@ -1,6 +1,6 @@
--- /dev/null
+++ b/crypto/unlzma.c
-@@ -0,0 +1,710 @@
+@@ -0,0 +1,721 @@
+/*
+ * LZMA uncompresion module for pcomp
+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
@@ -69,6 +69,7 @@
+ u8 previous_byte;
+ ssize_t pos;
+ struct unlzma_buffer *head;
++ int buf_full;
+
+ /* cstate */
+ int state;
@@ -87,11 +88,32 @@
+}
+
+static void
++get_buffer(struct unlzma_ctx *ctx)
++{
++ struct unlzma_buffer *bh;
++
++ bh = kzalloc(sizeof(struct unlzma_buffer), GFP_KERNEL);
++ bh->ptr = ctx->next_out;
++ bh->offset = ctx->pos;
++ bh->last = ctx->head;
++ bh->size = ctx->avail_out;
++ ctx->head = bh;
++ ctx->buf_full = 0;
++}
++
++static void
+unlzma_request_buffer(struct unlzma_ctx *ctx, int *avail)
+{
-+ mutex_unlock(&ctx->mutex);
-+ wait_event(ctx->next_req, unlzma_should_stop(ctx) || (*avail > 0));
-+ mutex_lock(&ctx->mutex);
++ do {
++ mutex_unlock(&ctx->mutex);
++ if (wait_event_interruptible(ctx->next_req,
++ unlzma_should_stop(ctx) || (*avail > 0)))
++ schedule();
++ mutex_lock(&ctx->mutex);
++ } while (*avail <= 0 && !unlzma_should_stop(ctx));
++
++ if (!unlzma_should_stop(ctx) && ctx->buf_full)
++ get_buffer(ctx);
+}
+
+static u8
@@ -196,36 +218,20 @@
+
+ while (bh->offset > pos) {
+ bh = bh->last;
-+ if (!bh)
-+ return 0;
++ BUG_ON(!bh);
+ }
+
+ pos -= bh->offset;
-+ if (pos > bh->size)
-+ return 0;
++ BUG_ON(pos >= bh->size);
+
+ return bh->ptr[pos];
+}
+
+static void
-+get_buffer(struct unlzma_ctx *ctx)
-+{
-+ struct unlzma_buffer *bh;
-+
-+ bh = kzalloc(sizeof(struct unlzma_buffer), GFP_KERNEL);
-+ bh->ptr = ctx->next_out;
-+ bh->offset = ctx->pos;
-+ bh->last = ctx->head;
-+ bh->size = ctx->avail_out;
-+ ctx->head = bh;
-+}
-+
-+static void
+write_byte(struct unlzma_ctx *ctx, u8 byte)
+{
+ if (unlikely(ctx->avail_out <= 0)) {
+ unlzma_request_buffer(ctx, &ctx->avail_out);
-+ get_buffer(ctx);
+ }
+
+ if (!ctx->avail_out)
@@ -234,6 +240,8 @@
+ ctx->previous_byte = byte;
+ *(ctx->next_out++) = byte;
+ ctx->avail_out--;
++ if (ctx->avail_out == 0)
++ ctx->buf_full = 1;
+ ctx->pos++;
+}
+
@@ -489,7 +497,8 @@
+ if (ctx->workspace_size < num_probs * sizeof(*p)) {
+ if (ctx->workspace)
+ vfree(ctx->workspace);
-+ ctx->workspace = vmalloc(num_probs * sizeof(*p));
++ ctx->workspace_size = num_probs * sizeof(*p);
++ ctx->workspace = vmalloc(ctx->workspace_size);
+ }
+ p = (u16 *) ctx->workspace;
+ if (!p)
@@ -652,6 +661,8 @@
+ req->avail_in = ctx->avail_in;
+ req->next_out = ctx->next_out;
+ req->avail_out = ctx->avail_out;
++ ctx->next_in = 0;
++ ctx->avail_in = 0;
+ pos = ctx->pos - pos;
+
+out: