fix lock-up issues in lzma pcomp support in 2.6.30 (used in squashfs). thanks to...

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16886 3c298f89-4303-0410-b956-a3cf2f4a3e73

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 (file)
--- 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: