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SubjectRe: [PATCH] Re: Firmware loading problem
On Fri, Aug 01, 2003 at 05:05:38PM +0200, Manuel Estrada Sainz wrote:
> On Sun, Jul 27, 2003 at 11:21:34PM +0200, Manuel Estrada Sainz wrote:
> > On Sun, Jul 27, 2003 at 08:21:11PM +0100, Matthew Wilcox wrote:
> > > On Sat, Jul 26, 2003 at 11:04:58AM +0200, Manuel Estrada Sainz wrote:
> > > > - hopefully adapt drivers/pci/pci-sysfs.c to this changes
> > > > - Please double check, I didn't look very carefully on
> > > > this.
> > >
> > > Definitely wrong. I was going to undo this change since I realised how
> > > it doesn't work for you; but the change you made to the PCI code is wrong.
> > > It ends up copying everything to offset 0 from the buf address.
> >
> > Exactly, and that is what sysfs code expects (with the rest of the
> > patch), the buffer is just temporary storage, it doesn't really matter
> > what offset you use as long as you don't write further than
> > buffer+PAGE_SIZE and both sides of the issue agree.
>
> My fault, I was severely misguided here, Matthew is of course write.
> Now that I understand the issue a little deeper I'll try send a correct
> patch to get the issue done with.

OK, this time I have tested the PCI changes and it works:

the patches:

- sysfs-bin-unbreak-2-main.diff:
- undo recent change, made in the believe that "buffer" was the
size of the whole file, it is just PAGE_SIZE in size. This was
causing kernel memory corruption.

- Since files are allowed to have unknown sizes, by
setting their size to 0, we can't preallocate a buffer
of their size on open.

- sysfs-bin-unbreak-2-request_firmware.diff:
- Adapt to the above sysfs change.

- sysfs-bin-unbreak-2-pci.diff:
- hopefully adapt drivers/pci/pci-sysfs.c to this changes.
- Matthew can probably make it look prettier, but for
now it works.

Have a nice day

Manuel


--
--- Manuel Estrada Sainz <ranty@debian.org>
<ranty@bigfoot.com>
<ranty@users.sourceforge.net>
------------------------ <manuel.estrada@hispalinux.es> -------------------
Let us have the serenity to accept the things we cannot change, courage to
change the things we can, and wisdom to know the difference.
--- fs/sysfs/bin.c 4 Jul 2003 02:21:18 -0000 1.9
+++ fs/sysfs/bin.c 1 Aug 2003 14:26:45 -0000
@@ -47,7 +47,7 @@
return ret;
count = ret;

- if (copy_to_user(userbuf, buffer + offs, count) != 0)
+ if (copy_to_user(userbuf, buffer, count) != 0)
return -EINVAL;

pr_debug("offs = %lld, *off = %lld, count = %zd\n", offs, *off, count);
@@ -83,7 +83,7 @@
count = size - offs;
}

- if (copy_from_user(buffer + offs, userbuf, count))
+ if (copy_from_user(buffer, userbuf, count))
return -EFAULT;

count = flush_write(dentry, buffer, offs, count);--- drivers/pci/pci-sysfs.c 4 Jul 2003 02:21:18 -0000 1.6
+++ drivers/pci/pci-sysfs.c 1 Aug 2003 14:26:43 -0000
@@ -67,6 +67,7 @@
{
struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
unsigned int size = 64;
+ loff_t init_off = off;

/* Several chips lock up trying to read undefined config space */
if (capable(CAP_SYS_ADMIN)) {
@@ -87,7 +88,7 @@
while (off & 3) {
unsigned char val;
pci_read_config_byte(dev, off, &val);
- buf[off] = val;
+ buf[off - init_off] = val;
off++;
if (--size == 0)
break;
@@ -96,10 +97,10 @@
while (size > 3) {
unsigned int val;
pci_read_config_dword(dev, off, &val);
- buf[off] = val & 0xff;
- buf[off + 1] = (val >> 8) & 0xff;
- buf[off + 2] = (val >> 16) & 0xff;
- buf[off + 3] = (val >> 24) & 0xff;
+ buf[off - init_off] = val & 0xff;
+ buf[off - init_off + 1] = (val >> 8) & 0xff;
+ buf[off - init_off + 2] = (val >> 16) & 0xff;
+ buf[off - init_off + 3] = (val >> 24) & 0xff;
off += 4;
size -= 4;
}
@@ -107,7 +108,7 @@
while (size > 0) {
unsigned char val;
pci_read_config_byte(dev, off, &val);
- buf[off] = val;
+ buf[off - init_off] = val;
off++;
--size;
}
@@ -120,6 +121,7 @@
{
struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
unsigned int size = count;
+ loff_t init_off = off;

if (off > 256)
return 0;
@@ -129,24 +131,24 @@
}

while (off & 3) {
- pci_write_config_byte(dev, off, buf[off]);
+ pci_write_config_byte(dev, off, buf[off - init_off]);
off++;
if (--size == 0)
break;
}

while (size > 3) {
- unsigned int val = buf[off];
- val |= (unsigned int) buf[off + 1] << 8;
- val |= (unsigned int) buf[off + 2] << 16;
- val |= (unsigned int) buf[off + 3] << 24;
+ unsigned int val = buf[off - init_off];
+ val |= (unsigned int) buf[off - init_off + 1] << 8;
+ val |= (unsigned int) buf[off - init_off + 2] << 16;
+ val |= (unsigned int) buf[off - init_off + 3] << 24;
pci_write_config_dword(dev, off, val);
off += 4;
size -= 4;
}

while (size > 0) {
- pci_write_config_byte(dev, off, buf[off]);
+ pci_write_config_byte(dev, off, buf[off - init_off]);
off++;
--size;
}--- drivers/base/firmware_class.c 26 Jul 2003 08:38:07 -0000
+++ drivers/base/firmware_class.c 1 Aug 2003 14:26:41 -0000
@@ -151,7 +151,7 @@
if (offset + count > fw->size)
count = fw->size - offset;

- memcpy(buffer + offset, fw->data + offset, count);
+ memcpy(buffer, fw->data + offset, count);
return count;
}
static int
@@ -200,7 +200,7 @@
if (retval)
return retval;

- memcpy(fw->data + offset, buffer + offset, count);
+ memcpy(fw->data + offset, buffer, count);

fw->size = max_t(size_t, offset + count, fw->size);
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