crypto: acomp - define max size for destination

The acomp API allows to send requests with a NULL destination buffer. In
this case, the algorithm implementation needs to allocate the
destination scatter list, perform the operation and return the buffer to
the user. For decompression, data is likely to expand and be bigger
than the allocated buffer.

Define the maximum size (128KB) that acomp implementations will allocate
for decompression operations as destination buffer when they receive a
request with a NULL destination buffer.

Suggested-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index cb3d6b1c655decb8bf092c7a97b73897fe1a79b8..e4bc96528902e51432aabf66dd7e8595618ea22e 100644 (file)
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -11,6 +11,7 @@
 #include <linux/crypto.h>
 
 #define CRYPTO_ACOMP_ALLOC_OUTPUT      0x00000001
+#define CRYPTO_ACOMP_DST_MAX           131072
 
 /**
  * struct acomp_req - asynchronous (de)compression request