Messages in this thread Patch in this message | | | Subject | Incorrect timeout in CDROM_SEND_PACKET ioctl in 2.5 kernels | From | Peter Osterlund <> | Date | 13 Jul 2003 18:12:56 +0200 |
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The CDROM_SEND_PACKET ioctl passes a struct cdrom_generic_command from user space, which contains a timeout field. The timeout is measured in jiffies, but the conversion from user to kernel jiffies is missing, which makes the timeout 10 times shorter than it should be in 2.5 kernels on x86. This causes CDRW formatting with cdrwtool to fail. The following patch fixes this problem.
--- linux/drivers/cdrom/cdrom.c.old Sun Jul 13 16:34:37 2003 +++ linux/drivers/cdrom/cdrom.c Sun Jul 13 15:19:11 2003 @@ -295,6 +295,8 @@ #define cdinfo(type, fmt, args...) #endif +#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) + /* These are used to simplify getting data in from and back to user land */ #define IOCTL_IN(arg, type, in) \ if (copy_from_user(&(in), (type *) (arg), sizeof (in))) \ @@ -2171,6 +2173,7 @@ return -ENOSYS; cdinfo(CD_DO_IOCTL, "entering CDROM_SEND_PACKET\n"); IOCTL_IN(arg, struct cdrom_generic_command, cgc); + cgc.timeout = MULDIV(cgc.timeout, HZ, USER_HZ); return cdrom_do_cmd(cdi, &cgc); } case CDROM_NEXT_WRITABLE: { -- Peter Osterlund - petero2@telia.com http://w1.894.telia.com/~u89404340 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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