Re: [PATCH] ums_realtek: do not use stack memory for DMA
From: Sergei Shtylyov
Date: Thu Aug 25 2011 - 06:52:44 EST
Hello.
On 24-08-2011 22:22, Adam Cozzette wrote:
This patch changes rts51x_read_mem, rts51x_write_mem, and rts51x_read_status to
allocate temporary buffers with kmalloc. This way stack addresses are not used
for DMA when these functions call rts51x_bulk_transport.
Signed-off-by: Adam Cozzette<acozzette@xxxxxxxxxx>
---
realtek_cr.c | 35 ++++++++++++++++++++++++++++++-----
1 file changed, 30 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c
index 34adc4b..232167a 100644
--- a/drivers/usb/storage/realtek_cr.c
+++ b/drivers/usb/storage/realtek_cr.c
[...]
@@ -342,6 +351,12 @@ static int rts51x_write_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
{
int retval;
u8 cmnd[12] = { 0 };
+ u8 *buf;
+
+ buf = kmalloc(len, GFP_NOIO);
+ if (buf == NULL)
+ return USB_STOR_TRANSPORT_ERROR;
+ memcpy(buf, data, len);
You could use kmemdup() instead of kmalloc()/memcpy()...
WBR, Sergei
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