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[PATCH] USB: cdc-acm: add a new special case for modems with buggy firmware

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this fixes the "duplicated text" bug. There's a modem that cannot cope
with large transfers and more than one urb in flight. This patch adds a
special case to the driver.

Signed-off-by: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum
2006-05-13 22:50:47 +02:00
committed by Greg Kroah-Hartman
parent 5cd330f4f3
commit 86478944eb
2 changed files with 59 additions and 39 deletions
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16
drivers/usb/class/cdc-acm.h
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@@ -56,11 +56,11 @@
* in line disciplines. They ask for empty space amount, receive our URB size,
* and proceed to issue several 1-character writes, assuming they will fit.
* The very first write takes a complete URB. Fortunately, this only happens
* when processing onlcr, so we only need 2 buffers.
* when processing onlcr, so we only need 2 buffers. These values must be
* powers of 2.
*/
#define ACM_NWB 2
#define ACM_NRU 16
#define ACM_NRB 16
#define ACM_NW 2
#define ACM_NR 16
struct acm_wb {
unsigned char *buf;
@@ -91,9 +91,10 @@ struct acm {
struct urb *ctrlurb, *writeurb; /* urbs */
u8 *ctrl_buffer; /* buffers of urbs */
dma_addr_t ctrl_dma; /* dma handles of buffers */
struct acm_wb wb[ACM_NWB];
struct acm_ru ru[ACM_NRU];
struct acm_rb rb[ACM_NRB];
struct acm_wb wb[ACM_NW];
struct acm_ru ru[ACM_NR];
struct acm_rb rb[ACM_NR];
int rx_buflimit;
int rx_endpoint;
spinlock_t read_lock;
struct list_head spare_read_urbs;
@@ -122,3 +123,4 @@ struct acm {
/* constants describing various quirks and errors */
#define NO_UNION_NORMAL 1
#define SINGLE_RX_URB 2