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usb-serial: Increase receive buffer to 496

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A FTDI USB adapter on an xHCI controller can send 512 byte USB packets.
These are 8 * ( 2 bytes header + 62 bytes data).  A 384 byte receive
buffer is insufficient to fill a 512 byte packet, so bump the receive
size to 496 ( 512 - 2 * 8 ).

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Message-id: 20200316174610.115820-4-jandryuk@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Jason Andryuk 2020-03-16 13:46:09 -04:00 committed by Gerd Hoffmann
parent 87db78f743
commit 30ad5fdd34
1 changed files with 1 additions and 1 deletions
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2
hw/usb/dev-serial.c
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@ -29,7 +29,7 @@ do { printf("usb-serial: " fmt , ## __VA_ARGS__); } while (0)
#define DPRINTF(fmt, ...) do {} while(0) #define DPRINTF(fmt, ...) do {} while(0)
#endif #endif
#define RECV_BUF 384 #define RECV_BUF (512 - (2 * 8))
/* Commands */ /* Commands */
#define FTDI_RESET 0 #define FTDI_RESET 0