On 08/06/07, Surya <[EMAIL PROTECTED]> wrote: <snip>
> > msg(DBG_INI,"check_drives done.\n"); > > + if(request_region_flag==0) > > + release_region(addr[1],4); > > I know the driver in its current version just tests if the region is > available and doesn't hang on to it, but I'm wondering if that's not a > bug. Shouldn't we actually hold on to this region as long as the > driver is loaded and only release the region in the sbpcd_exit() > function, just loke we do with the "CDo_command" region? But if any of the conditions fail after the request_region code, it is returning an error and exiting out of init. Dont we need to cleanup request_region's allocation before we exit.
Probably.
Infact I had a feeling that CDo_command region cleanup was not perfect. Did a cleanup of both the regions wherever we have a return out of the function.
That makes sense to me.
Please have a look at the below patch. diff --git a/drivers/cdrom/sbpcd.c b/drivers/cdrom/sbpcd.c index a1283b1..0a85b1b 100644 --- a/drivers/cdrom/sbpcd.c +++ b/drivers/cdrom/sbpcd.c @@ -358,6 +358,10 @@ * Add bio/kdev_t changes for 2.5.x required to make it work again. * Still room for improvement in the request handling here if anyone * actually cares. Bring your own chainsaw. Paul G. 02/2002 + * + *
Why two blank comment lines? Isn't one enough?
+ * Cleaned up the reference for deprecated check_region to + * request_region. - Surya Prabhakar N 08/07/2007 */ @@ -555,6 +559,8 @@ static struct cdrom_read_audio read_audio; static unsigned char msgnum; static char msgbuf[80]; +static int addr[2]; + static int max_drives = MAX_DRIVES; module_param(max_drives, int, 0); #ifndef MODULE @@ -5638,7 +5644,7 @@ int __init sbpcd_init(void) #endif { int i=0, j=0;
Blank line between variable declarations and code please.
- int addr[2]={1, CDROM_PORT}; + addr[2]={1, CDROM_PORT}; int port_index;
Keep the variables together and seperate from the code. Like this : { int i=0, j=0; int port_index; addr[2]={1, CDROM_PORT}; ...
sti();
Just in case you are bored, at some point those cli()/sti() need to go away as well and be replaced with proper locking. But that's a different patch :-)
@@ -5670,9 +5676,9 @@ int __init sbpcd_init(void) { addr[1]=sbpcd[port_index]; if (addr[1]==0) break; - if (check_region(addr[1],4)) + if (!request_region(addr[1],4, "sbpcd driver")) { - msg(DBG_INF,"check_region: %03X is not free.\n",addr[1]); + msg(DBG_INF,"request_region: %03X is not free.\n",addr[1]); continue; } if (sbpcd[port_index+1]==2) type=str_sp; @@ -5699,6 +5705,7 @@ int __init sbpcd_init(void) if (ndrives==0) { msg(DBG_INF, "No drive found.\n"); + release_region(addr[1],4);
If we get here after actually having obtained a region an ndrives is then 0, then we should ofcourse release the region before we bail out. makes sense.
#ifdef MODULE return -EIO; #else @@ -5775,6 +5782,7 @@ int __init sbpcd_init(void) if (!request_region(CDo_command,4,major_name)) { printk(KERN_WARNING "sbpcd: Unable to request region 0x%x\n", CDo_command); + release_region(addr[1],4); return -EIO; }
This makes sense. If we bail out due to not being able to obtain the CDo_command region, then we should release the other region.
@@ -5788,6 +5796,8 @@ int __init sbpcd_init(void) #endif /* SOUND_BASE */ if (register_blkdev(MAJOR_NR, major_name)) { + release_region(CDo_command,4); + release_region(addr[1],4); #ifdef MODULE return -EIO; #else @@ -5801,6 +5811,7 @@ int __init sbpcd_init(void) sbpcd_queue = blk_init_queue(do_sbpcd_request, &sbpcd_lock); if (!sbpcd_queue) { release_region(CDo_command,4); + release_region(addr[1],4); unregister_blkdev(MAJOR_NR, major_name); return -ENOMEM; } @@ -5834,6 +5845,7 @@ int __init sbpcd_init(void) printk("Can't unregister %s\n", major_name); } release_region(CDo_command,4); + release_region(addr[1],4); blk_cleanup_queue(sbpcd_queue); return -EIO; } @@ -5850,6 +5862,7 @@ int __init sbpcd_init(void) if (sbpcd_infop == NULL) { release_region(CDo_command,4); + release_region(addr[1],4); blk_cleanup_queue(sbpcd_queue); return -ENOMEM; } @@ -5894,6 +5907,7 @@ static void sbpcd_exit(void) return; } release_region(CDo_command,4); + release_region(addr[1],4); blk_cleanup_queue(sbpcd_queue); for (j=0;j<NR_SBPCD;j++) { Kindly update if this is Ok. I will proceed with the original patch.
This looks a lot better to me. I have only given it a quick look, but I don't see any major problems.
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