> -----Original Message----- > From: santosh prasad nayak [mailto:santoshprasadnayak@xxxxxxxxx] > Sent: Sunday, March 04, 2012 2:48 PM > To: Sony Chacko > Cc: Rajesh Borundia; netdev; Dhananjay Phadke; kernel- > janitors@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] netxen: memory corruption by > netxen_p3_get_mac_addr. > > I would like to drop this patch. > > > Actually I was trying to simulate the code block by generating assembly > code > which looked like as shown below. But later I realized it does not > fit with present scenario. > Its for different scenario. > > ----------------------------------------------------------------------- > ------------------------------- > 80483cb: 83 ec 2c sub $0x2c,%esp > 80483ce: 66 c7 44 24 1e e1 2e movw $0x2ee1,0x1e(%esp) > 80483d5: 66 c7 44 24 1c e1 2e movw $0x2ee1,0x1c(%esp) > 80483dc: 0f b7 44 24 1c movzwl 0x1c(%esp),%eax > 80483e1: c1 e0 04 shl $0x4,%eax > 80483e4: 88 44 24 1b mov %al,0x1b(%esp) > 80483e8: 0f b6 5c 24 1b movzbl 0x1b(%esp),%ebx > 80483ed: 0f b7 4c 24 1c movzwl 0x1c(%esp),%ecx > 80483f2: 0f b7 54 24 1e movzwl 0x1e(%esp),%edx > ----------------------------------------------------------------------- > ------------------------------------- > > > > Following assembly code looks very near to present scenario. > And there is no data loss . > > ----------------------------------------------------------------------- > ------------------------ > 804839a: 83 ec 10 sub $0x10,%esp > 804839d: 66 c7 44 24 0e e1 2e movw $0x2ee1,0xe(%esp) > 80483a4: 66 c7 44 24 0c e1 2e movw $0x2ee1,0xc(%esp) > 80483ab: 0f b7 44 24 0c movzwl 0xc(%esp),%eax > 80483b0: ba 00 00 00 00 mov $0x0,%edx > 80483b5: 0f a4 c2 04 shld $0x4,%eax,%edx > 80483b9: c1 e0 04 shl $0x4,%eax > 80483bc: 89 04 24 mov %eax,(%esp) > 80483bf: 89 54 24 04 mov %edx,0x4(%esp) > 80483c3: b8 00 00 00 00 mov $0x0,%eax > ----------------------------------------------------------------------- > ---------------------------- > > > Sorry for the inconvenience. > > > Regarding endian issue: > -------------------------------------- > Can Rajesh or Dhananjay comment on it ? > Is "le64_to_cpu" there intentionally ?? > Yes , le64_to_cpu is intentional the NXRD32/readl will swap the bytes and at lower address we will have MSB. So while referencing it with byte array we need a extra swap. Rajesh > Regards > santosh > > > On Sun, Mar 4, 2012 at 12:05 AM, Dan Carpenter > <dan.carpenter@xxxxxxxxxx> wrote: > > On Sat, Mar 03, 2012 at 10:31:27PM +0530, santosh nayak wrote: > >> From: Santosh Nayak <santoshprasadnayak@xxxxxxxxx> > >> > >> 'mac_hi' and 'mac_lo' are 32 bit unsinged int but we are modifing > >> 64 bit of memory during mac calculation. To fix this issue define > >> a local variable of 64 bit and do mac calculation. > >> > > > > I'm not seeing any memory corruption. How do you figure? > > > >> Remove 'le64_to_cpu' to fix endian issue. > > > > I've add Dhananjay to the CC list to comment on the endian change. > > > > regards, > > dan carpenter > > > >> > >> Signed-off-by: Santosh Nayak <santoshprasadnayak@xxxxxxxxx> > >> --- > >> drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c | 7 ++++--- > >> 1 files changed, 4 insertions(+), 3 deletions(-) > >> > >> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c > b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c > >> index 0f81287..7ea930b 100644 > >> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c > >> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c > >> @@ -1069,7 +1069,8 @@ int netxen_get_flash_mac_addr(struct > netxen_adapter *adapter, u64 *mac) > >> > >> int netxen_p3_get_mac_addr(struct netxen_adapter *adapter, u64 > *mac) > >> { > >> - uint32_t crbaddr, mac_hi, mac_lo; > >> + uint32_t crbaddr; > >> + u64 mac_hi, mac_lo; > >> int pci_func = adapter->ahw.pci_func; > >> > >> crbaddr = CRB_MAC_BLOCK_START + > >> @@ -1079,9 +1080,9 @@ int netxen_p3_get_mac_addr(struct > netxen_adapter *adapter, u64 *mac) > >> mac_hi = NXRD32(adapter, crbaddr+4); > >> > >> if (pci_func & 1) > >> - *mac = le64_to_cpu((mac_lo >> 16) | ((u64)mac_hi << > 16)); > >> + *mac = (mac_lo >> 16) | (mac_hi << 16); > >> else > >> - *mac = le64_to_cpu((u64)mac_lo | ((u64)mac_hi << 32)); > >> + *mac = mac_lo | (mac_hi << 32); > >> > >> return 0; > >> } > >> -- > >> 1.7.4.4 > >> > >> -- > >> To unsubscribe from this list: send the line "unsubscribe kernel- > janitors" in > >> the body of a message to majordomo@xxxxxxxxxxxxxxx > >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
