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staging/fwserial: Assume firmware is OHCI-complaint 

Devices which are OHCI v1.0/ v1.1/ v1.2-draft compliant or
RFC 2734 compliant are required by specification to support
max_rec of 8 (512 bytes) or more. Accept reported value.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-01-28 20:57:48 -05:00 committed by Greg Kroah-Hartman
parent 3b1f315415
commit 9883a7396b
1 changed files with 7 additions and 2 deletions
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9
drivers/staging/fwserial/fwserial.c
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@ -174,10 +174,15 @@ static void dump_profile(struct seq_file *m, struct stats *stats)
#define dump_profile(m, stats) #define dump_profile(m, stats)
#endif #endif
/* Returns the max receive packet size for the given node */ /*
* Returns the max receive packet size for the given node
* Devices which are OHCI v1.0/ v1.1/ v1.2-draft or RFC 2734 compliant
* are required by specification to support max_rec of 8 (512 bytes) or more.
*/
static inline int device_max_receive(struct fw_device *fw_device) static inline int device_max_receive(struct fw_device *fw_device)
{ {
return 1 << (clamp_t(int, fw_device->max_rec, 8U, 11U) + 1); /* see IEEE 1394-2008 table 8-8 */
return min(2 << fw_device->max_rec, 4096);
} }
static void fwtty_log_tx_error(struct fwtty_port *port, int rcode) static void fwtty_log_tx_error(struct fwtty_port *port, int rcode)